TM-9-2320-272-23-1
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 1 OF 5
SEPTEMBER 2012
TM-9-2320-272-23-1 - Page 923 of 1313
HORN INOPERATIVE - Continued
STEP
6.
DOES HORN SWITCH WORK PROPERLY?
a.
Check operation of horn switch.
b.
Refer to point to point schematics.
T0103DAA
25
Figure 6.
Horn Switch Test.
c.
Reconnect circuit 25 wire to horn solenoid.
d.
Disconnect circuit 25 wire from horn switch.
e.
Connect one end of jumper wire to vehicle chassis ground.
NOTE
If horn operates, horn switch is faulty.
f.
Touch other end of jumper wire to disconnected end of circuit 25 wire.
TM 9-2320-272-23-1
0109
0109-8
Back to Top
